China's trade contracts in May for another month

A worker repairs the ground at a container port in Qingdao in eastern China's Shandong province Wednesday, June 8, 2016. China's exports and imports contracted again in May in a sign of weak global and domestic demand. (Chinatopix Via AP) CHINA OUT
(The Associated Press)

St. Paul, Minn., Mayor Chris Coleman takes a photo at the Temple of Heaven in Beijing, Wednesday, June 8, 2016. Coleman is part of a delegation of leaders from American cities participating in the U.S.-China Climate-Smart/Low-Carbon Cities Summit. (AP Photo/Mark Schiefelbein)
(The Associated Press)

Trade weakness could complicate Beijing's efforts to pull the world's second-largest economy out of a slump. Weak exports could require more economic stimulus, setting back efforts to reduce reliance on trade and investment to drive growth.